Update the rtc-ep93xx driver to use ioremap'ed addresses.

This removes the dependency on <mach/hardware.h> and properly
reports the memory addresses used by the driver in /proc/iomem.

In addition, ep93xx_rtc_init() is updated to use
platform_driver_probe() instead of platform_driver_register().

Also, the device_create_file() calls are now properly checked for
error conditions.  The created sysfs files are also now removed
when the driver is removed.

The version number for the driver has been bumped at the request
of Alessandro Zummo.
Signed-off-by: NH Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: NAlessandro Zummo <a.zummo@towertech.it>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>